Potez 4D

The Potez 4D was a four-cylinder, inverted inline aircraft engine. It was first built shortly before World War II, but did not enter full production until 1949. The cylinders had a bore of 125 mm (4.9 in) and a stroke of 120 mm (4.7 in). Power for different models was in the 100 kW-190 kW (140 hp-260 hp) range.

Applications

• Morane-Saulnier MS.700 Petrel
• Nord NC 840
• Nord N 3202

Specifications (Potez 4-D 01)

Data from Jane's All The World's Aircraft 1953-54 ^[1]

General characteristics

• Type: Four-cylinder air-cooled inverted inline engine
• Bore: 125 mm (4.92 in)
• Stroke: 120 mm (4.72 in)
• Displacement: 5.85 L (352 in³)
• Length: 1,207.5 mm (47.5 in)
• Width: 510 mm (20.1 in)
• Height: 668.5 mm (26.3 in)
• Dry weight: 143 kg (314.6 lb)

Components

• Valvetrain: Two valves per cylinder with sodium cooled exhaust valves
• Fuel system: One Zenith carburettor
• Fuel type: 80 octane minimum
• Oil system: Dry sump with one pressure and two scavenge pumps
• Cooling system: air-cooled

Performance

• Power output: 119 kW (160 hp) at 2,520 rpm (take-off), 97 kW (130 hp) at 2,360 rpm (Max cruise)
• Compression ratio: 7:1
• Specific fuel consumption: 245 gram/hp/hour (take-off)
• Power-to-weight ratio: 0.83 kW/kg (0.51 hp/lb) (take-off)

Notes

References

• Bridgman, Leonard (ed.) (1953). Jane's All The World's Aircraft 1953-54. London: Jane's. 
• Gunston, Bill (1986). World Encyclopedia of Aero Engines. Wellingborough: Patrick Stephens. pp. 107.